Idiom
Which statement regarding the mammalian heart is correct?

Oxygen-loaded blood moves only through the right side of the heart
Blood is pumped from the heart via the atria
In the adult heart, blood in the right chambers of the heart cannot enter the left chambers without passing through the lungs
When the right atrium contracts, it forces blood into the left atrium

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Idiom
To turn over a new leaf

To shift attention to new problems
To change completely one's course of action
To cover up one's faults by wearing new masks
To change the old habits and adopt new ones

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